This paper reports the first experimental observation of Anderson localization in a non-interacting Bose-Einstein condensate (BEC) in a one-dimensional quasi-periodic optical lattice. The authors use a system where the interaction between atoms can be tuned independently, allowing for the study of disorder-induced localization. The experiment involves a BEC perturbed by a weak, incommensurate secondary lattice, which creates a crossover between extended and exponentially localized states. The localization is demonstrated through transport properties, spatial, and momentum distributions. The critical disorder strength scales with the tunneling energy of the atoms in the lattice. The system's controllability makes it a valuable platform for studying the interplay between disorder and interaction, as well as exploring exotic quantum phases. The findings provide insights into the Anderson localization transition in one dimension, a phenomenon that has been observed in various systems but never directly in matter waves.This paper reports the first experimental observation of Anderson localization in a non-interacting Bose-Einstein condensate (BEC) in a one-dimensional quasi-periodic optical lattice. The authors use a system where the interaction between atoms can be tuned independently, allowing for the study of disorder-induced localization. The experiment involves a BEC perturbed by a weak, incommensurate secondary lattice, which creates a crossover between extended and exponentially localized states. The localization is demonstrated through transport properties, spatial, and momentum distributions. The critical disorder strength scales with the tunneling energy of the atoms in the lattice. The system's controllability makes it a valuable platform for studying the interplay between disorder and interaction, as well as exploring exotic quantum phases. The findings provide insights into the Anderson localization transition in one dimension, a phenomenon that has been observed in various systems but never directly in matter waves.